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mail store vmdk too large, need to change disks

A little background:
We attached a large (2tb) vmdk to store our mail, mounted to /opt/zimbra/store. VMware doesn't do snapshots of volumes this large so we need to downsize. We are currently using less than 100g of the 2tb volume.

My plan is:
- Create a new vmdk to attach to our mailbox vm at /media/temp
- rsync /opt/zimbra/store to the new volume
- stop zimbra, sync again
- umount the 2tb vmdk
- change the mount for the new vmdk to /opt/zimbra/store.
- start zimbra